Republican officials and leading figures in the party’s establishment are now preparing for the possibility of a brokered convention as Donald Trump continues sit atop the polls and the presidential race.

More than 20 of them convened Monday for a dinner held by Republican National Committee Chairman Reince Priebus, where the prospect of Trump nearing next year’s nominating convention in Cleveland with a significant number of delegates dominated the discussion, according to five people familiar with the meeting.

Considering that scenario as Priebus and Senate Majority Leader Mitch McConnell (R-Ky.) listened, several longtime power brokers argued that if the controversial billionaire storms through the primaries, the party’s establishment must lay the groundwork for a floor fight, in which the GOP’s mainstream wing could coalesce around an alternative, the people said.

Because of the sensitivity of the topic — and wary of saying something that, if leaked, would provoke Trump to bolt the party and mount an independent bid — Priebus and McConnell were mostly quiet during the back and forth. They did not signal support for an overt anti-Trump effort.

But near the end, McConnell and Priebus did acknowledge to the group that a deadlocked convention is indeed something the party should prepare for, both institutionally at the RNC and politically at all levels in the coming months.